I have three Burris xtrs; 2 XTR IIs and 1 XTR III. I am a big fan of these scopes and have used them for years hunting and competing. I've experienced no tracking issues or any other real complications. I'm in the market for a new scope and I'd really like to know what people think about the Sig optics. A buddy has a Whiskey6, likes it but has only used it twice. It looks good and is in my price range. Anyone have an opinion?